If the search engine (in this case, Yahoo!) displays information about your site taken from the Yahoo! Directory instead of your description meta tag, you can force it to ignore the directory information by including a robots meta tag like this: <meta name="robots" content="noydir" />.It should also be perfectly reasonable to specify instructions for each individual crawling robot, such as indicated below.If you only have the problem with Google, you can use this: <meta name="googlebot" content="noodp" />.If you only have the problem with Yahoo!, you can use this: <meta name="slurp" content="noydir" />.If you only have the problem with MSN, you can use this: <meta name="msnbot" content="noodp" />.One of the most succinct methods is to use a single robots meta tag with multiple attributes separated by commas like this: <meta name="robots" content="noodp,noydir" />.

The noodp tag prevents Google from using a DMOZ-meta description in search snippets. If you write a meta description, it’s highly likely that your goal is to have that meta description appear in search results. Therefore, Yoast SEO automatically adds the noodp tag whenever you’ve set a meta description template or manually set a meta description on the item.